I believe the bulkhead and the hull are tabbed together, so I can't see how water in the bulkhead could get into the hull core.
However, I suggest checking your deck. They just cut a slot through the deck when they installed the chainplates, as opposed to bedding them in solid glass. When I pulled my chainplates, I found a couple inches of core rot in the deck. We dug out the rotted core surrounding the chainplates, dried it, and filled it all up with epoxy, so now the deck core is isolated from any future chainplate leaks.
